How to sign VersionedTransaction

[jxad]

How do i sign / partial_sign a VersionedTransaction?

[jxad]

I managed to partially sign the V0 tx obtained from MagicEden API. Using this as a reference, I ended up with this code:

from solders.null_signer import NullSigner
from solders.transaction import VersionedTransaction

txv0_data = bytes(res["v0"]["txSigned"]["data"])

txv0 = VersionedTransaction.from_bytes(txv0_data)
sigs = txv0.signatures

payer = Keypair.from_base58_string("priv_key")
for i, acc in enumerate(txv0.message.account_keys):
  if txv0.message.is_signer(i) and acc != payer.pubkey():
     me_signer = acc

signers = (payer, NullSigner(me_signer))

new_tx = VersionedTransaction(txv0.message, signers)

sigs[0] = new_tx.signatures[0]

txv0.signatures = sigs

print(txv0.signatures)
print(txv0.verify_with_results())

Did I miss an easier way to achieve this?

[kevinheavey]

No that's basically how you do it. This answer also shows how to deserialize the partially signed txn and add the missing signature (the python code looks more or less the same): https://solana.stackexchange.com/a/5179/383